Suppose you read a research report that claimed to have uncovered a finding with significant implications for policy. The researchers summarize the results of a multicity homicide reduction program that they claim was markedly effective. They support this claim by pointing out that, during the study period, there was a mean reduction af 1.80 homicides per month across the cities in the sample. Along with that mean, they report a 95% confidence interval of-40

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Suppose you read a research report that claimed to have uncovered a finding with significant
implications for policy. The researchers summarize the results of a multicity homicide reduction
program that they claim was markedly effective. They support this claim by pointing out that,
during the study period, there was a mean reduction af 1.80 homicides per month across the
cities in the sample. Along with that mean, they report a 95% confidence interval of -40 sus4
(i.e., 1.80 + 2.20). What is wrong with the researchers' claim that this program was effective?
Identify the flaw in their logic and explain why that flaw makes their claim unsupportable.
Transcribed Image Text:Suppose you read a research report that claimed to have uncovered a finding with significant implications for policy. The researchers summarize the results of a multicity homicide reduction program that they claim was markedly effective. They support this claim by pointing out that, during the study period, there was a mean reduction af 1.80 homicides per month across the cities in the sample. Along with that mean, they report a 95% confidence interval of -40 sus4 (i.e., 1.80 + 2.20). What is wrong with the researchers' claim that this program was effective? Identify the flaw in their logic and explain why that flaw makes their claim unsupportable.
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